The Anxiety Disorders Association of America (ADAA) works to improve the lives of people who have anxiety disorders. Members of the association are not only people who have or are interested in anxiety disorders but also health professionals who do research and treat people who have anxiety disorders.

The International Society for Traumatic Stress Studies (ISTSS) is an international forum for sharing research, clinical strategies, and public policy concerns on traumatic stress. The Society offers newsletters and other publications, conferences, and links from its Web site to other organizations that have the same interests.

The National Alliance on Mental Illness is a national self-help and family advocacy organization dedicated solely to improving the lives of people who have severe mental illnesses such as schizophrenia, bipolar disorder (manic depression), major depression, obsessive-compulsive disorder, and panic disorder. NAMI focuses on support, education, advocacy, and research. The mission of the organization is to "eradicate mental illness and improve the quality of life of those affected by these diseases."

The National Center for PTSD carries out a wide range of activities, including research, education, and training to help understand, diagnose, and treat PTSD in veterans. The website has fact sheets and videos to answer questions on trauma, PTSD, and related issues.

The National Institute of Mental Health (NIMH) provides information to help people better understand mental health, mental disorders, and behavioral problems. NIMH does not provide referrals to mental health professionals or treatment for mental health problems.

The National Suicide Prevention Lifeline is a 24-hour, toll-free suicide prevention service. Crisis centers are located in 130 locations across the United States. Callers are routed to the closest provider of mental health and suicide prevention services.